Stirrer organ in composite construction

Abstract

The invention relates to a stirrer organ ( 1 ) in composite construction comprised of a metallic part ( 4 ) and a hybrid casting ( 9 ), with the hybrid casting ( 9 ) being fixed to the metallic part ( 4 ) by means of at least one anchoring element which forms at least one back-cutting in the hybrid casting ( 9 ). Furthermore, the present invention relates to a method for rehabilitating a damaged metallic stirrer organ which when applied provides a rehabilitated stirrer organ ( 1 ) in composite construction. The invention tackles the task of creating a stirrer organ ( 1 ) in hybrid construction which features a largest possible metallic part ( 4 ) because higher strength can hereby be achieved. This task is inventively solved in that the anchoring element is provided with a perforated plate ( 5 ) which is spot-wise fastened to the metallic part ( 4 ) and which is arranged at least partly at a small distance to the surface of the metallic part ( 4 ) so as to configure the at least one back-cutting.

The invention claimed is: 
     
       1. Stirrer organ ( 1 ) in composite construction comprised of a metallic part ( 4 ) and a hybrid casting ( 9 ), with the hybrid casting ( 9 ) being fixed to the metallic part ( 4 ) by means of at least one anchoring element which forms at least one back-cutting in the hybrid casting ( 9 ), wherein the anchoring element is provided with a perforated plate ( 5 ) which is spot-wise fastened to the metallic part ( 4 ) and which is arranged at least partly at a small distance to the surface of the metallic part ( 4 ) so as to configure the at least one back-cutting. 
     
     
       2. Stirrer organ ( 1 ) according to  claim 1 , wherein the perforated plate ( 5 ) is fastened to the metallic part ( 4 ) indirectly via spacer pieces ( 6 ) and wherein it is arranged by means of the spacer pieces ( 6 ) partly at a small distance to the surface of the metallic part ( 4 ). 
     
     
       3. Stirrer organ ( 1 ) according to  claim 2 , wherein the spacer pieces ( 6 ) are designed and built as washers. 
     
     
       4. Stirrer organ ( 1 ) according to  claim 2 , wherein the spacer pieces ( 6 ) are fastened to the metallic part ( 4 ) by applying the spot welding technique. 
     
     
       5. Stirrer organ ( 1 ) according to  claim 1 , wherein the perforated plate ( 5 ) is indirectly fastened to the metallic part ( 4 ) at fastening points ( 7 ) by applying the spot welding technique, the perforated plate ( 5 ) being arched-away from the metallic part ( 4 ) in at least one area between the fastening points ( 7 ), thus being partly arranged at a small distance to the surface of the metallic part ( 4 ). 
     
     
       6. Stirrer organ ( 1 ) according to  claim 1 , wherein the thickness of the perforated plate ( 5 ) ranges between 0.2 and 2 mm. 
     
     
       7. Stirrer organ ( 1 ) according to  claim 6 , wherein the small distance between the perforated plate ( 5 ) and the surface of the metallic part ( 4 ) roughly corresponds to 1.5 times to double the thickness of the perforated plate ( 5 ). 
     
     
       8. Stirrer organ ( 1 ) according to  claim 1 , wherein the perforated plate ( 5 ) has a plurality of rectangular perforations in straight rows. 
     
     
       9. Stirrer organ ( 1 ) according to  claim 1 , wherein the hybrid cast is applied by casting-on or trowelling-on.